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Financial Instruments - Fair Values and Risk Management - Summary of Changes in Liabilities Arising from Financing Activities (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance   € 56,091 € 51,684
Cash flows     4,407
Ending balance     56,091
Long-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance € 18,412 20,943 25,717
Cash flows (1,800) (1,365) (4,774)
Other changes (186) (1,166)  
Ending balance 16,426 18,412 20,943
Lease liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 57,367 56,758  
Cash flows (9,907) (11,960)  
Other changes 6,133 12,569  
Ending balance 53,593 57,367 56,758
Short-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 22,196 33,386 25,967
Cash flows 6,518 (11,190) 7,419
Other changes (13)    
Ending balance 28,701 22,196 33,386
Bank overdrafts [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 1,974 1,762  
Cash flows 137 212 1,762
Ending balance 2,111 1,974 1,762
Adjusted balance due to lease liability [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 99,949 112,849  
Cash flows (5,052) (24,303)  
Other changes 5,934 11,403  
Ending balance € 100,831 € 99,949 € 112,849